<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        // 一行打印五个星星 
        // console.log('★★★★★');
        // for (let i = 1; i <= 5; i++) {
        //     console.log('★');

        // }
        // let str = '';
        // for (let i = 1; i <= 5; i++) {
        //     str = str + '★';
        // }
        // console.log(str);
        let num = prompt('请输入星星的个数');
        let str = '';
        for (let i = 1; i <= num; i++) {
            str = str + '★'
        }
        console.log(str);
    </script>
</head>
<body>

</body>
</html>